Refrigeration cycle apparatus

ABSTRACT

A refrigeration cycle apparatus includes a heat source unit including a compressor, a flow switching valve, a first heat exchanger, and an expansion valve, an air-conditioning unit including a second heat exchanger and configured to perform air-conditioning, and a hot water supply unit including a third heat exchanger and configured to supply hot water. The flow switching valve includes a first port connected to a discharge port of the compressor, a second port connected to the second heat exchanger, a third port connected to a suction port of the compressor, and a fourth port connected to the first heat exchanger. The flow switching valve is set to one of a first state in which the second port communicates with the third port, the third port communicates with the fourth port, and the first port does not communicate with any ports, a second state in which the first port communicates with the fourth port, and the second port communicates with the third port, and a third state in which the first port communicates with the second port, and the third port communicates with the fourth port.

TECHNICAL FIELD

The present disclosure relates to a refrigeration cycle apparatus thatsupplies hot water and performs air-conditioning.

BACKGROUND ART

In the related art, refrigeration cycle apparatuses capable of supplyinghot water and performing air-conditioning at the same time are known.For example, in Patent Literature 1, a refrigeration cycle apparatusthat controls refrigerant flows by using two solenoid valves and afour-way valve provided on the discharge side of a compressor to performa hot water supply cooling operation, a cooling operation, a heatingoperation, or a hot water supply operation is proposed.

CITATION LIST Patent Literature

Patent Literature 1: Japanese Patent No. 6141425

SUMMARY OF INVENTION Technical Problem

The refrigeration cycle apparatus of Patent Literature 1 achievesswitching of operation among the hot water supply cooling operation,cooling operation, heating operation, and the hot water supply operationwith a complicated valve configuration. In this case, because aplurality of valves is required, there are problems, such as an increasein cost of the apparatus as well as an increase in complication ofcontrol.

The present disclosure has been made to solve the problems describedabove, and has an object to provide a refrigeration cycle apparatuscapable of performing hot water supply, cooling, and heating withimproved controllability with a less number of components.

Solution to Problem

A refrigeration cycle apparatus according to an embodiment of thepresent disclosure includes a heat source unit including a compressor, aflow switching valve, a first heat exchanger, and an expansion valve, anair-conditioning unit including a second heat exchanger and configuredto perform air-conditioning, and a hot water supply unit including athird heat exchanger and configured to supply hot water. The flowswitching valve includes a first port connected to a discharge port ofthe compressor, a second port connected to the second heat exchanger, athird port connected to a suction port of the compressor, and a fourthport connected to the first heat exchanger. The flow switching valve isset to one of a first state in which the second port communicates withthe third port, the third port communicates with the fourth port, andthe first port does not communicate with any ports, a second state inwhich the first port communicates with the fourth port, and the secondport communicates with the third port, and a third state in which thefirst port communicates with the second port, and the third portcommunicates with the fourth port.

Advantageous Effects of Invention

Because the refrigeration cycle apparatus according to an embodiment ofthe present disclosure is provided with the flow switching valve thathas the first port connected to a discharge port of the compressor andis capable of achieving the first state in which the first port does notcommunicate with any ports, the number of components can be reduced andthe controllability can be improved.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic configuration diagram of a refrigeration cycleapparatus according to Embodiment 1.

FIG. 2 is a control block diagram of the refrigeration cycle apparatusaccording to Embodiment 1.

FIG. 3 is a diagram illustrating behavior of a cooling operation of therefrigeration cycle apparatus according to Embodiment 1.

FIG. 4 is a diagram illustrating behavior of a heating operation of therefrigeration cycle apparatus according to Embodiment 1.

FIG. 5 is a diagram illustrating behavior of a hot water supplyoperation of the refrigeration cycle apparatus according to Embodiment1.

FIG. 6 is a diagram illustrating behavior of a first hot water supplycooling operation of the refrigeration cycle apparatus according toEmbodiment 1.

FIG. 7 is a diagram illustrating behavior of a second hot water supplycooling operation of the refrigeration cycle apparatus according toEmbodiment 1.

FIG. 8 is a diagram illustrating behavior of a third hot water supplycooling operation of the refrigeration cycle apparatus according toEmbodiment 1.

FIG. 9 is a diagram illustrating behavior of a first hot water supplyheating operation of the refrigeration cycle apparatus according toEmbodiment 1.

FIG. 10 is a table illustrating a list of controls in each operation ofthe refrigeration cycle apparatus according to Embodiment 1.

DESCRIPTION OF EMBODIMENTS

An embodiment of the present disclosure will be described below withreference to the drawings. Note that, in the drawings, the same orcorresponding components are denoted by the same reference symbol, andtheir descriptions will be omitted or simplified, as appropriate. Inaddition, the shape, size, and arrangement of each of the componentsillustrated in the drawings can be changed, as appropriate, within thescope of the present disclosure.

Embodiment 1 Configuration of Refrigeration Cycle Apparatus

FIG. 1 is a schematic configuration diagram of a refrigeration cycleapparatus 100 according to Embodiment 1. As shown in FIG. 1 , therefrigeration cycle apparatus 100 of Embodiment 1 includes a heat sourceunit 1, an air-conditioning unit 2, and a hot water supply unit 3. Inthe refrigeration cycle apparatus 100 of Embodiment 1, a coolingoperation or a heating operation, which is performed by theair-conditioning unit 2, and a hot water supply operation, which isperformed by the hot water supply unit 3, can be conducted individuallyor simultaneously. The heat source unit 1, the air-conditioning unit 2,and the hot water supply unit 3 are connected with each other via a pipeand wiring, such as a power supply line or a signal line.

The heat source unit 1 is configured to supply heating energy andcooling energy to the air-conditioning unit 2 and the hot water supplyunit 3. The heat source unit 1 includes a compressor 11, a flowswitching valve 12, a first heat exchanger 13, a first fan 14, anaccumulator 15, a first expansion valve 16, a second expansion valve 17,a third expansion valve 18, an on-off valve 19, and a controller 5.

The air-conditioning unit 2 is configured to cool and heat anair-conditioned space such as a living room. The air-conditioning unit 2is, for example, an indoor unit. The air-conditioning unit 2 includes asecond heat exchanger 21 and a second fan 22.

The hot water supply unit 3 is configured to heat water and supply hotwater. The hot water supply unit 3 includes a third heat exchanger 31, ahot water storage tank 32, a pump 33, and a fourth heat exchanger 34.

The refrigeration cycle apparatus 100 includes an air-conditioningrefrigerant circuit, a hot water supply refrigerant circuit, and a heatmedium circuit. The air-conditioning refrigerant circuit is formed byconnecting the compressor 11, the flow switching valve 12, the firstheat exchanger 13, the first expansion valve 16, the second expansionvalve 17, the second heat exchanger 21, and the accumulator 15 by pipes.The hot water supply refrigerant circuit is formed by a pipe branchedfrom the pipe between the compressor 11 and the flow switching valve 12,the on-off valve 19, the third heat exchanger 31, and the thirdexpansion valve 18, which are connected by pipes, and a pipe connectedto the pipe between the first expansion valve 16 and the secondexpansion valve 17. The heat medium circuit is formed by connecting thepump 33, the third heat exchanger 31, and the fourth heat exchanger 34by pipes.

The refrigerant circulating in the air-conditioning refrigerant circuitand the hot water supply refrigerant circuit is, for example, a naturalrefrigerant, such as carbon dioxide, hydrocarbon, or helium, achlorine-free refrigerant, such as HFC410A or HFC407C, or achlorofluorocarbon-based refrigerant, such as R22 or R134a. The heatmedium circulating in the heat medium circuit is water or brine in whichantifreeze is mixed.

The compressor 11 is a fluid machine that sucks and compressesrefrigerant in a low-pressure gas state and discharges the refrigerantin a high-pressure gas state. As the compressor 11, an inverter-drivencompressor capable of adjusting an operation frequency is used. Theoperation frequency of the compressor 11 is controlled by the controller5. A discharge side pipe connected to the discharge port of thecompressor 11 is branched on the way, and the one end thereof isconnected to the third heat exchanger 31 via the on-off valve 19 and theother end thereof is connected to the flow switching valve 12. Inaddition, the discharge port of the compressor 11 is provided with adischarge temperature sensor T1 detecting a discharge temperature of therefrigerant.

The flow switching valve 12 is a four-way valve, and has a first port A,a second port B, a third port C, and a fourth port D. The first port Ais connected to the discharge port of the compressor 11. The second portB is connected to the second heat exchanger 21. The third port C isconnected to the suction port of the compressor 11 via the accumulator15. The fourth port D is connected to the first heat exchanger 13. Theflow switching valve 12 can be set to a first state, a second state, ora third state. In the first state, the second port B communicates withthe third port C, the third port C communicates with the fourth port D,and the first port A does not communicate with any ports and is closed.In the second state, the first port A communicates with the fourth portD, and the second port B communicates with the third port C. In thethird state, the first port A communicates with the second port B, andthe third port C communicates with the fourth port D. The flow switchingvalve 12 is switched from one state to another by the controller 5.

The first heat exchanger 13 is configured to exchange heat between therefrigerant flowing therein and air sent by the first fan 14. The firstheat exchanger 13 is, for example, a fin tube type heat exchanger. Thefirst heat exchanger 13 is provided between the first expansion valve 16and the flow switching valve 12. The first heat exchanger 13 functionsas a condenser in the cooling operation and as an evaporator in theheating operation and the hot water supply operation. The first heatexchanger 13 is provided with a first refrigerant temperature sensor T2detecting the temperature of the refrigerant flowing in the first heatexchanger 13. In addition, an outlet of the first heat exchanger 13, theoutlet from which the refrigerant is discharged in the coolingoperation, is provided with a first outlet temperature sensor T3detecting the temperature of the refrigerant flowing out from the firstheat exchanger 13.

The first fan 14 is configured to suck air from the outside of theair-conditioned space, pass the air through the first heat exchanger 13,and blow out the air to the outside of the air-conditioned space. Thefirst fan 14 is, for example, a propeller fan, a sirocco fan, or a crossflow fan, which is driven by a motor. The air volume of the first fan 14is controlled by the controller 5.

The accumulator 15 is configured to divide the refrigerant flowedtherein into the refrigerant in a gas state and the refrigerant in aliquid state, and allow only the refrigerant in a gas state to enter thecompressor 11. The accumulator 15 can store excess refrigerant duringoperation as well as can prevent the refrigerant in a liquid state fromentering the compressor 11 during state change of the refrigerant. Theaccumulator 15 is provided between the suction port of the compressor 11and the flow switching valve 12. Note that the accumulator 15 is not arequired component for the refrigeration cycle apparatus 100 and may beomitted. When the accumulator 15 is omitted, the suction port of thecompressor 11 is directly connected to the third port C.

The first expansion valve 16, the second expansion valve 17, and thethird expansion valve 18 are electronic expansion valves configured todecompress refrigerant. The first expansion valve 16 is provided on anoutlet side of the first heat exchanger 13 in the cooling operation. Thesecond expansion valve 17 is provided on an outlet side of the secondheat exchanger 21 in the heating operation. The third expansion valve 18is provided on a pipe that is branched from the pipe connecting thefirst expansion valve 16 and the second expansion valve 17, and that isconnected to the third heat exchanger 31. The opening degrees of thefirst expansion valve 16, the second expansion valve 17, and the thirdexpansion valve 18 are controlled by the controller 5.

The on-off valve 19 is a solenoid valve. The opening and closing of theon-off valve 19 are controlled by the controller 5. The on-off valve 19is provided on a pipe that is branched from the pipe connecting thedischarge port of the compressor 11 and the first port A of the flowswitching valve 12, and that is connected to the third heat exchanger31. When the on-off valve 19 is opened, the refrigerant flows in a hotwater supply refrigerant circuit. When the on-off valve 19 is closed,the refrigerant does not flow in the hot water supply side refrigerantcircuit.

The second heat exchanger 21 is configured to exchange heat between therefrigerant flowing therein and air sent by the second fan 22. Thesecond heat exchanger 21 is, for example, a fin tube type heatexchanger. The second heat exchanger 21 is provided between the secondexpansion valve 17 and the flow switching valve 12. The second heatexchanger 21 functions as a condenser in the heating operation and as anevaporator in the cooling operation. The second heat exchanger 21 isprovided with a second refrigerant temperature sensor T4 detecting thetemperature of the refrigerant flowing in the second heat exchanger 21.In addition, an outlet of the second heat exchanger 21 the outlet fromwhich the refrigerant is discharged in the heating operation, isprovided with a second outlet temperature sensor T5 detecting thetemperature of the refrigerant flowing out from the second heatexchanger 21.

The second fan 22 is configured to suck air from the outside of theair-conditioned space, pass the air through the second heat exchanger21, and blow out the air to the outside of the air-conditioned space Thesecond fan 22 is, for example, a propeller fan, a sirocco fan, or across flow fan, which is driven by a motor. The air volume of the secondfan 22 is controlled by the controller 5. An air outlet from which airis blown out by the second fan 22 is provided with a blowing temperaturesensor T6 detecting the temperature of the blown out air. An air inletfrom which air is sucked by the second fan 22 is provided with an indoortemperature sensor T7 detecting the temperature of the sucked indoorair.

The third heat exchanger 31 is configured to exchange heat between therefrigerant flowing therein and the heat medium sent by the pump 33. Thethird heat exchanger 31 is, for example, a plate type heat exchanger.The third heat exchanger 31 is provided between the on-off valve 19 andthe third expansion valve 18. The third heat exchanger 31 is providedwith a third refrigerant temperature sensor T8 detecting the temperatureof the refrigerant flowing in the third heat exchanger 31. In addition,an outlet of the third heat exchanger 31, the outlet from which therefrigerant is discharged, is provided with a third outlet temperaturesensor T9 detecting the temperature of the refrigerant flowing out fromthe third heat exchanger 31.

The hot water storage tank 32 is a cylindrical tank made of a metal,such as stainless, or a resin or another material. The inside of the hotwater storage tank 32 is provided with a hot water supply temperaturesensor T10 detecting the temperature of the hot water in the hot waterstorage tank 32.

The pump 33 causes the heat medium to circulate in the heat mediumcircuit. The pump 33 is provided with an inverter circuit (not shown).The rotation speed of the pump 33 is controlled by the controller 5.

The fourth heat exchanger 34 is installed inside the hot water storagetank 32. The fourth heat exchanger 34 is configured to exchange heatbetween the water in the hot water storage tank 32 and the heat mediumcirculating in the heat medium circuit. Through the heat exchange, thewater in the hot water storage tank 32 is heated, and thus hot water isgenerated. The fourth heat exchanger 34 is, for example, a coil typeheat exchanger.

The controller 5 is a microcomputer including a processor, a memory,such as a ROM or RAM, an I/O port, and other devices. The controller 5is configured to control operations of the heat source unit 1, theair-conditioning unit 2, and the hot water supply unit 3. Note that, inEmbodiment 1, although the heat source unit 1 includes the controller 5,the arrangement of the controller 5 is not limited thereto. For example,the controller 5 may be provided in the air-conditioning unit 2 or thehot water supply unit 3. The heat source unit 1, the air-conditioningunit 2, and the hot water supply unit 3 may be provided with respectivecontrollers 5, and the controllers 5 may be configured to communicatewith each other. In addition, the controller 5 may be provided in amanagement device that manages the refrigeration cycle apparatus 100.

FIG. 2 is a control block diagram of the refrigeration cycle apparatus100 according to Embodiment 1. The controller 5 is configured to controlthe entire operation of the refrigeration cycle apparatus 100 based onsetting information, which is entered via a remote controller or asimilar device, and detection results of the temperature sensors T1 toT10. The setting information to be entered via a remote controller or asimilar device includes, for example, setting for operation to beperformed, a cooling set temperature, a heating set temperature, airvolume setting, and a hot water supply set temperature. The controller 5is configured to control the operation frequency of the compressor 11,the state of the flow switching valve 12, the opening degrees of thefirst to third expansion valves 16 to 18, the opening and dosing of theon-off valve 19, the air volumes of the first fan 14 and the second fan22, and the rotation speed of the pump 33.

Operation of Refrigeration Cycle Apparatus

The controller 5 is configured to perform the cooling operation, theheating operation, the hot water supply operation, the hot water supplycooling operation, and the hot water supply heating operation. Thecooling operation is an operation in which hot water supply is notperformed by the hot water supply unit 3 and only cooling is performedby the air-conditioning unit 2. The heating operation is an operation inwhich hot water supply is not performed by the hot water supply unit 3and only heating is performed by the air-conditioning unit 2. The hotwater supply operation is an operation in which only hot water supply isperformed by the hot water supply unit 3 and cooling or heating is notperformed by the air-conditioning unit 2. The hot water supply coolingoperation is an operation in which hot water supply by the hot watersupply unit 3 and cooling by the air-conditioning unit 2 are performedconcurrently. The hot water supply heating operation is an operation inwhich hot water supply by the hot water supply unit 3 and heating by theair-conditioning unit 2 are performed concurrently.

In addition, the controller 5 is configured to perform, as the hot watersupply cooling operation, a first hot water supply cooling operation inwhich a hot water supply load is large and a cooling load is large, asecond hot water supply cooling operation in which a hot water supplyload is large and a cooling load is small, a third hot water supplycooling operation in which a hot water supply load is small and acooling load is large, and a fourth hot water supply cooling operationin which a hot water supply load is small and a cooling load is small.Furthermore, the controller 5 is configured to perform, as the hot watersupply heating operation, a first hot water supply heating operation inwhich a hot water supply load is large and a heating load is large, asecond hot water supply heating operation in which a hot water supplyload is large and a heating load is small, a third hot water supplyheating operation in which a hot water supply load is small and aheating load is large, and a fourth hot water supply heating operationin which a hot water supply load is small and a heating load is small.

Here, “a large hot water supply load” means a case where a value ΔTw,which is obtained by subtracting a hot water supply temperature detectedby the hot water supply temperature sensor T10 from the hot water supplyset temperature, is equal to or larger than a predetermined threshold α,and “a small hot water supply load” means a case where the value ΔTw isless than the threshold α. In addition, “a large cooling load” means acase where a value ΔTc, which is obtained by subtracting the cooling settemperature from an indoor temperature detected by the indoortemperature sensor T7, is equal to or larger than a predetermined valueβ, and “a small cooling load” means a case where the value ΔTc is lessthan the threshold β. Furthermore, “a large heating load” means a casewhere a value ΔTh, which is obtained by subtracting an indoortemperature detected by the indoor temperature sensor T7 from theheating set temperature, is equal to or larger than a predeterminedvalue β, and “a small heating load” means a case where the value ΔTh isless than the threshold β. The thresholds α and β are 5 degrees C., forexample.

The cooling operation, the heating operation, the hot water supplyoperation, the first to fourth hot water supply cooling operations, andthe first to fourth hot water supply heating operations are switched bycontrolling the state of the flow switching valve 12, the openingdegrees of the first to third expansion valves 16 to 18, and the openingand closing of the on-off valve 19 by the controller 5. Refrigerantflows and control of each unit in each operation will be describedbelow.

Cooling Operation

FIG. 3 is a diagram illustrating behavior of the cooling operation ofthe refrigeration cycle apparatus 100 according to Embodiment 1. Arrowsin FIG. 3 indicate directions of refrigerant flow. In the coolingoperation, the controller 5 sets the flow switching valve 12 to thesecond state, in which the first port A communicates with the fourthport D and the second port B communicates with the third port C, andcloses the third expansion valve 18 and the on-off valve 19. Inaddition, the controller 5 controls the opening degree of the firstexpansion valve 16 and the opening degree of the second expansion valve17 according to an operation state. Furthermore, the controller 5controls the frequency of the compressor 11 according to the coolingload in the air-conditioned space. For example, when the cooling load islarge, the controller 5 increases the frequency of the compressor 11.When the cooling load is small, the controller 5 reduces the frequencyof the compressor 11.

As shown in FIG. 3 , in the cooling operation, the refrigerant that hasbeen compressed by the compressor 11 and thus enters a high-temperature,high-pressure gas state flows into the first heat exchanger 13 via thefirst port A and the fourth port D of the flow switching valve 12. Therefrigerant changes its phase from high-temperature, high-pressure gasto liquid in the first heat exchanger 13 while the refrigerant heats theair passing through the first heat exchanger 13. Then, the refrigerantis decompressed by the first expansion valve 16 and the second expansionvalve 17, and enters a two-phase state in which low-temperature,low-pressure liquid and gas are mixed. The refrigerant in the two-phasestate flows into the second heat exchanger 21.

The controller 5 controls the opening degree of the first expansionvalve 16 so that the degree of subcooling of the first heat exchanger 13reaches a target degree of subcooling. The degree of subcooling of thefirst heat exchanger 13 is obtained from the difference between thecondensation temperature detected by the first refrigerant 674499temperature sensor T2 and the outlet temperature detected by the firstoutlet temperature sensor T3. In addition, the controller 5 controls theopening degree of the second expansion valve 17 so that the dischargetemperature detected by the discharge temperature sensor T1 reaches atarget discharge temperature. The target degree of subcooling and thetarget discharge temperature are set in advance based on installationconditions and specifications of the refrigeration cycle apparatus 100and the cooling set temperature, and are stored in the controller 5.

The refrigerant flowed into the second heat exchanger 21 changes itsphase from liquid to gas while the refrigerant cools the air passingthrough the second heat exchanger 21. When the cooled air is blown tothe air-conditioned space, the air-conditioned space is cooled. Then,the refrigerant flows into the accumulator 15 via the second port B andthe third port C of the flow switching valve 12. The refrigerant is thensucked into the compressor 11 and enters a high-temperature,high-pressure gas state again.

Heating Operation

FIG. 4 is a diagram illustrating behavior of the heating operation ofthe refrigeration cycle apparatus 100 according to Embodiment 1. Arrowsin FIG. 4 indicate directions of refrigerant flow. In the heatingoperation, the controller 5 sets the flow switching valve 12 to thethird state, in which the first port A communicates with the second portB and the third port C communicates with the fourth port D, and closesthe third expansion valve 18 and the on-off valve 19. In addition, thecontroller 5 controls the opening degree of the first expansion valve 16and the opening degree of the second expansion valve 17 according to anoperation state. Furthermore, the controller 5 controls the frequency ofthe compressor 11 according to the heating load in the air-conditionedspace. For example, when the heating load is large, the controller 5increases the frequency of the compressor 11. When the heating load issmall, the controller 5 reduces the frequency of the compressor 11.

As shown in FIG. 4 , in the heating operation, the refrigerant that hasbeen compressed by the compressor 11 and thus enters a high-temperature,high-pressure gas state flows into the second heat exchanger 21 via thefirst port A and the second port B of the flow switching valve 12. Therefrigerant changes its phase from high-temperature, high-pressure gasto liquid in the second heat exchanger 21 while the refrigerant heatsthe air passing through the second heat exchanger 21. When the heatedair is blown to the air-conditioned space, the air-conditioned space isheated. Then, the refrigerant is decompressed by the second expansionvalve 17 and the first expansion valve 16, and enters a two-phase statein which low-temperature, low-pressure liquid and gas are mixed. Therefrigerant in the two-phase state flows into the first heat exchanger13.

The controller 5 controls the opening degree of the second expansionvalve 17 so that the degree of subcooling of the second heat exchanger21 reaches a target degree of subcooling. The degree of subcooling ofthe second heat exchanger 21 is obtained from the difference between thecondensation temperature detected by the second refrigerant temperaturesensor T4 and the outlet temperature detected by the second outlettemperature sensor T5. In addition, the controller 5 controls theopening degree of the first expansion valve 16 so that the dischargetemperature detected by the discharge temperature sensor T1 reaches atarget discharge temperature. The target degree of subcooling and thetarget discharge temperature are set in advance based on installationconditions and specifications of the refrigeration cycle apparatus 100and the heating set temperature, and are stored in the controller 5.

The refrigerant flowed into the first heat exchanger 13 changes itsphase from liquid to gas while the refrigerant cools the air passingthrough the first heat exchanger 13. Then, the refrigerant flows intothe accumulator 15 via the fourth port D and the third port C of theflow switching valve 12. The refrigerant is then sucked into thecompressor 11 and enters a high-temperature, high-pressure gas stateagain.

Hot Water Supply Operation

FIG. 5 is a diagram illustrating behavior of the hot water supplyoperation of the refrigeration cycle apparatus 100 according toEmbodiment 1. Arrows in FIG. 5 indicate directions of refrigerant flow.In the hot water supply operation, the controller 5 sets the flowswitching valve 12 to the first state, in which the second port Bcommunicates with the third port C and the third port C communicateswith the fourth port D, closes the second expansion valve 1 and opensthe on-off valve 19. In addition, the controller 5 controls the openingdegree of the first expansion valve 16 and the opening degree of thethird expansion valve 18 according to an operation state. Furthermore,the controller 5 controls the frequency of the compressor 11 accordingto the hot water supply load. For example, when the hot water supplyload is large, the controller 5 increases the frequency of thecompressor 11. When the hot water supply load is small, the controller 5reduces the frequency of the compressor 11.

As shown in FIG. 5 , in the hot water supply operation, the refrigerantthat has been compressed by the compressor 11 and thus enters ahigh-temperature, high-pressure gas state flows into the third heatexchanger 31 via the on-off valve 19. The refrigerant changes its phasefrom high-temperature, high-pressure gas to liquid in the third heatexchanger 31 while the refrigerant heats the heat medium flowing in theheat medium circuit. When the heat medium heated by the third heatexchanger 31 enters the fourth heat exchanger 34, the water in the hotwater storage tank 32 is heated. As a result, hot water can be supplied.The refrigerant flowed out from the third heat exchanger 31 isdecompressed by the third expansion valve 18 and the first expansionvalve 16, and enters a two-phase state in which low-temperature,low-pressure liquid and gas are mixed. The refrigerant in the two-phasestate flows into the first heat exchanger 13.

The controller 5 controls the opening degree of the third expansionvalve 18 so that the degree of subcooling of the third heat exchanger 31reaches a target degree of subcooling. The degree of subcooling of thethird heat exchanger 31 is obtained from the difference between thecondensation temperature detected by the third refrigerant temperaturesensor T8 and the outlet temperature detected by the third outlettemperature sensor T9. In addition, the controller 5 controls theopening degree of the first expansion valve 16 so that the dischargetemperature detected by the discharge temperature sensor T1 reaches atarget discharge temperature. The target degree of subcooling and thetarget discharge temperature are set in advance based on installationconditions and specifications of the refrigeration cycle apparatus 100and the hot water supply set temperature, and are stored in thecontroller 5.

The refrigerant flowed into the first heat exchanger 13 changes itsphase from liquid to gas while the refrigerant cools the air passingthrough the first heat exchanger 13. Then, the refrigerant flows intothe accumulator 15 via the fourth port D and the third port C of theflow switching valve 12. The refrigerant is then sucked into thecompressor 11 and enters a high-temperature, high-pressure gas stateagain.

First Hot Water Supply Cooling Operation

FIG. 6 is a diagram illustrating behavior of the first hot water supplycooling operation of the refrigeration cycle apparatus 100 according toEmbodiment 1. Arrows in FIG. 6 indicate directions of refrigerant flow.The first hot water supply cooling operation is a hot water supplycooling operation in which hot water supply and cooling are performed atthe same, and is performed when the hot water supply load is large andthe cooling load is large. In the first hot water supply coolingoperation, the controller 5 sets the flow switching valve 12 to thefirst state, in which the second port B communicates with the third portC and the third port C communicates with the fourth port D, closes thefirst expansion valve 16, and opens the on-off valve 19. In addition,the controller 5 controls the opening degree of the second expansionvalve 17 and the opening degree of the third expansion valve 18according to an operation state. Furthermore, the controller 5 sets thefrequency of the compressor 11 high.

As shown in FIG. 6 , in the first hot water supply cooling operation,the refrigerant that has been compressed by the compressor 11 and thusenters a high-temperature, high-pressure gas state flows into the thirdheat exchanger 31 via the on-off valve 19. The refrigerant changes itsphase from high-temperature, high-pressure gas to liquid in the thirdheat exchanger 31 while the refrigerant heats the heat medium flowing inthe heat medium circuit. When the heat medium heated by the third heatexchanger 31 enters the fourth heat exchanger 34, the water in the hotwater storage tank 32 is heated. As a result, hot water can be supplied.The refrigerant flowed out from the third heat exchanger 31 isdecompressed by the third expansion valve 18 and the second expansionvalve 17, and enters a two-phase state in which low-temperature,low-pressure liquid and gas are mixed. The refrigerant in the two-phasestate flows into the second heat exchanger 21.

The controller 5 controls the opening degree of the second expansionvalve 17 so that the discharge temperature detected by the dischargetemperature sensor T1 reaches a target discharge temperature. Inaddition, the controller 5 controls the opening degree of the thirdexpansion valve 18 so that the degree of subcooling of the third heatexchanger 31 reaches a target degree of subcooling.

The refrigerant flowed into the second heat exchanger 21 changes itsphase from liquid to gas while the refrigerant cools the air passingthrough the second heat exchanger 21. When the cooled air is blown tothe air-conditioned space, the air-conditioned space is cooled. Then,the refrigerant flows into the accumulator 15 via the second port B andthe third port C of the flow switching valve 12. The refrigerant is thensucked into the compressor 11 and enters a high-temperature,high-pressure gas state again.

Second Hot Water Supply Cooling Operation

FIG. 7 is a diagram illustrating behavior of the second hot water supplycooling operation of the refrigeration cycle apparatus 100 according toEmbodiment 1. Arrows in FIG. 7 indicate directions of refrigerant flow.The second hot water supply cooling operation is a hot water supplycooling operation in which hot water supply and cooling are performed atthe same, and is performed when the hot water supply load is large andthe cooling load is small. In the second hot water supply coolingoperation, the controller 5 sets the flow switching valve 12 to thefirst state, in which the second port B communicates with the third portC and the third port C communicates with the fourth port D, and opensthe on-off valve 19. In addition, the controller 5 controls the openingdegree of the first expansion valve 16, the opening degree of the secondexpansion valve 17, and the opening degree of the third expansion valve18 according to an operation state. Furthermore, the controller 5 setsthe frequency of the compressor 11 high.

As shown in FIG. 7 , in the second hot water supply cooling operation,the refrigerant that has been compressed by the compressor 11 and thusenters a high-temperature, high-pressure gas state flows into the thirdheat exchanger 31 via the on-off valve 19. The refrigerant changes itsphase from high-temperature, high-pressure gas to liquid in the thirdheat exchanger 31 while the refrigerant heats the heat medium flowing inthe heat medium circuit. When the heat medium heated by the third heatexchanger 31 enters the fourth heat exchanger 34, the water in the hotwater storage tank 32 is heated. As a result, hot water can be supplied.

The refrigerant flowed out from the third heat exchanger 31 isdecompressed by the third expansion valve 18, and is divided to flowinto the second expansion valve 17 and the first expansion valve 16. Thecontroller 5 controls the opening degree of the third expansion valve 18so that the degree of subcooling of the third heat exchanger 31 reachesa target degree of subcooling. In addition, the controller 5 controlsthe opening degree of the first expansion valve 16 so that the dischargetemperature detected by the discharge temperature sensor T1 reaches atarget discharge temperature. Furthermore, the controller 5 controls theopening degree of the second expansion valve 17 so that the blowingtemperature detected by the blowing temperature sensor T6 reaches thecooling set temperature.

The refrigerant flowed into the second expansion valve 17 isdecompressed, and enters a two-phase state in which low-temperature,low-pressure liquid and gas are mixed. The refrigerant in the two-phasestate flows into the second heat exchanger 21. In the second heatexchanger 21, the refrigerant changes its phase from liquid to gas whilethe refrigerant cools the air passing through the second heat exchanger21. When the cooled air is blown to the air-conditioned space, theair-conditioned space is cooled. Then, the refrigerant flows into thesecond port B of the flow switching valve 12.

Meanwhile, the refrigerant flowed into the first expansion valve 16 isdecompressed, and enters a two-phase state in which low-temperature,low-pressure liquid and gas are mixed. The refrigerant in the two-phasestate flows into the first heat exchanger 13. In the first heatexchanger 13, the refrigerant changes its phase from liquid to gas whilethe refrigerant cools the air passing through the first heat exchanger13. Then, the refrigerant flows into the fourth port D of the flowswitching valve 12.

The refrigerant flowed through the second port B and the fourth port Dof the flow switching valve 12 flows into the accumulator 15 from thethird port C. Then, the refrigerant is sucked into the compressor 11,and enters a high-temperature, high-pressure gas state again. Asdescribed above, in the second hot water supply cooling operation,because the refrigerant is caused to flow also through the first heatexchanger 13 and the first heat exchanger 13 functions as an evaporator,a large hot water supply load can be handled even when the cooling loadis small.

Third Hot Water Supply Cooling Operation

FIG. 8 is a diagram illustrating behavior of the third hot water supplycooling operation of the refrigeration cycle apparatus 100 according toEmbodiment 1. Arrows in FIG. 8 indicate directions of refrigerant flow.The third hot water supply cooling operation is a hot water supplycooling operation in which hot water supply and cooling are performed atthe same, and is performed when the hot water supply load is small andthe cooling load is large. In the third hot water supply coolingoperation, the controller 5 sets the flow switching valve 12 to thesecond state, in which the first port A communicates with the fourthport D and the second port B communicates with the third port C, andopens the on-off valve 19. In addition, the controller 5 controls theopening degree of the first expansion valve 16, the opening degree ofthe second expansion valve 17, and the opening degree of the thirdexpansion valve 18 according to an operation state. Furthermore, thecontroller 5 sets the frequency of the compressor 11 high.

As shown in FIG. 8 , in the third hot water supply cooling operation,the refrigerant that has been compressed by the compressor 11 and thusenters a high-temperature, high-pressure gas state is divided to flowinto the on-off valve 19 and the first port A of the flow switchingvalve 12. The refrigerant flowed into the on-off valve 19 changes itsphase from high-temperature, high-pressure gas to liquid in the thirdheat exchanger 31 while the refrigerant heats the heat medium flowing inthe heat medium circuit. When the heat medium heated by the third heatexchanger 31 enters the fourth heat exchanger 34, the water in the hotwater storage tank 32 is heated. As a result, hot water can be supplied.The refrigerant flowed out from the third heat exchanger 31 isdecompressed by the third expansion valve 18, and flows into the secondexpansion valve 17.

Meanwhile, the refrigerant flowed into the first port A of the flowswitching valve 12 flows into the first heat exchanger 13 via the fourthport D. The refrigerant changes its phase from high-temperature,high-pressure gas to liquid in the first heat exchanger 13 while therefrigerant heats the air passing through the first heat exchanger 13.Then, the refrigerant is decompressed by the first expansion valve 16,and flows into the second expansion valve 17.

The controller 5 controls the opening degree of the first expansionvalve 16 so that the degree of subcooling of the first heat exchanger 13reaches a target degree of subcooling. In addition, the controller 5controls the opening degree of the second expansion valve 17 so that thedischarge temperature detected by the discharge temperature sensor T1reaches a target discharge temperature. Furthermore, the controller 5controls the opening degree of the third expansion valve 18 so that thehot water supply temperature detected by the hot water supplytemperature sensor T10 reaches the hot water supply set temperature.

The refrigerant flowed into the second expansion valve 17 enters atwo-phase state in which low-temperature, low-pressure liquid and gasare mixed. The refrigerant in the two-phase state flows into the secondheat exchanger 21. In the second heat exchanger 21, the refrigerantchanges its phase from liquid to gas while the refrigerant cools the airpassing through the second heat exchanger 21. When the cooled air isblown to the air-conditioned space, the air-conditioned space is cooled.Then, the refrigerant flows into the accumulator 15 via the second portB and the third port C of the flow switching valve 12. The refrigerantis then sucked into the compressor 11, and enters a high-temperature,high-pressure gas state again. As described above, in the third hotwater supply cooling operation, because the refrigerant is caused toflow also through the first heat exchanger 13 and the first heatexchanger 13 functions as a condenser, a large air conditioning load canbe handled even when the hot water supply load is small.

Fourth Hot Water Supply Cooling Operation

The fourth hot water supply cooling operation is a hot water supplycooling operation in which hot water supply and cooling are performed atthe same time, and is performed when the hot water supply load is smalland the cooling load is small. In the fourth hot water supply coolingoperation, the controls of the flow switching valve 12, the firstexpansion valve 16, the second expansion valve 17, the third expansionvalve 18, and the on-off valve 19 are the same as those of the first hotwater supply cooling operation. In addition, the refrigerant flows inthe fourth hot water supply cooling operation are the same as those ofthe first hot water supply cooling operation shown in FIG. 6 . Note,however, that the operation frequency of the compressor 11 in the fourthhot water supply cooling operation is set to lower than that in thefirst hot water supply cooling operation.

First Hot Water Supply Heating Operation

FIG. 9 is a diagram illustrating behavior of the first hot water supplyheating operation of the refrigeration cycle apparatus 100 according toEmbodiment 1. The first hot water supply heating operation is a hotwater supply heating operation in which hot water supply and heating areperformed at the same time, and is performed when the hot water supplyload is large and the heating load is large. In the first hot watersupply heating operation, the controller 5 set the flow switching valve12 to the third state, in which the first port A communicates with thesecond port B and the third port C communicates with the fourth port D,and opens the on-off valve 19. In addition, the controller 5 controlsthe opening degree of the first expansion valve 16, the opening degreeof the second expansion valve 17, and the opening degree of the thirdexpansion valve 18 according to an operation state. Furthermore, thecontroller 5 sets the frequency of the compressor 11 high.

As shown in FIG. 9 , in the first hot water supply heating operation,the refrigerant that has been compressed by the compressor 11 and thusenters a high-temperature, high-pressure gas state is divided to flowinto the on-off valve 19 and the first port A of the flow switchingvalve 12. The refrigerant flowed into the on-off valve 19 changes itsphase from high-temperature, high-pressure gas to liquid in the thirdheat exchanger 31 while the refrigerant heats the heat medium flowing inthe heat medium circuit. When the heat medium heated by the third heatexchanger 31 enters the fourth heat exchanger 34, the water in the hotwater storage tank 32 is heated. As a result, hot water can be supplied.The refrigerant flowed out from the third heat exchanger 31 isdecompressed by the third expansion valve 18, and flows into the firstexpansion valve 16.

Meanwhile, the refrigerant flowed into the first port A flows into thesecond heat exchanger 21 via the second port B. The refrigerant changesits phase from high-temperature, high-pressure gas to liquid in thesecond heat exchanger 21 while the refrigerant heats the air passingthrough the second heat exchanger 21. When the heated air is blown tothe air-conditioned space, the air-conditioned space is heated. Then,the refrigerant is decompressed by the second expansion valve 17, andflows into the first expansion valve 16.

The controller 5 controls the opening degree of the first expansionvalve 16 so that the discharge temperature detected by the dischargetemperature sensor T1 reaches a target discharge temperature. Inaddition, the controller 5 controls the opening degree of the secondexpansion valve 17 so that the degree of subcooling of the second heatexchanger 21 reaches a target degree of subcooling. Furthermore, thecontroller 5 controls the opening degree of the third expansion valve 18so that the degree of subcooling of the third heat exchanger 31 reachesa target degree of subcooling.

The refrigerant flowed into the first expansion valve 16 isdecompressed, and enters a two-phase state in which low-temperature,low-pressure liquid and gas are mixed. The refrigerant in the two-phasestate flows into the first heat exchanger 13. The refrigerant flowedinto the first heat exchanger 13 changes its phase from liquid to gaswhile the refrigerant cools the air passing through the first heatexchanger 13. Then, the refrigerant flows into the accumulator 15 viathe fourth port D and the third port C of the flow switching valve 12.The refrigerant is then sucked into the compressor 11, and enters ahigh-temperature, high-pressure gas state again.

Second Hot Water Supply Heating Operation

The second hot water supply heating operation is a hot water supplyheating operation in which hot water supply and heating are performed atthe same time, and is performed when the hot water supply load is largeand the heating load is small. In the second hot water supply heatingoperation, the controller 5 sets the flow switching valve 12 to thethird state, in which the first port A communicates with the second portB and the third port C communicates with the fourth port D, and opensthe on-off valve 19. In addition, the controller 5 controls the openingdegree of the first expansion valve 16, the opening degree of the secondexpansion valve 17, and the opening degree of the third expansion valve18 according to an operation state. Furthermore, the controller 5 setsthe frequency of the compressor 11 high.

The refrigerant flows in the second hot water supply heating operationare the same as those of the first hot water supply heating operationshown in FIG. 9 . In addition, the controls of the first expansion valve16 and the third expansion valve 18 are the same as those of the firsthot water supply heating operation. Note, however, that because thecooling load is small in the second hot water supply heating operation,the controller 5 controls the opening degree of the second expansionvalve 17 so that the blowing temperature detected by the blowingtemperature sensor T6 reaches the cooling set temperature.

Third Hot Water Supply Heating Operation

The third hot water supply heating operation is a hot water supplyheating operation in which hot water supply and heating are performed atthe same time, and is performed when the hot water supply load is smalland the heating load is large. In the third hot water supply heatingoperation, the controller 5 sets the flow switching valve 12 to thethird state, in which the first port A communicates with the second portB and the third port C communicates with the fourth port D, and opensthe on-off valve 19. In addition, the controller 5 controls the openingdegree of the first expansion valve 16, the opening degree of the secondexpansion valve 17, and the opening degree of the third expansion valve18 according to an operation state. Furthermore, the controller 5 setsthe frequency of the compressor 11 high.

The refrigerant flows in the third hot water supply heating operationare the same as those of the first hot water supply heating operationshown in FIG. 9 . In addition, the controls of the opening degrees ofthe first expansion valve 16 and the second expansion valve 17 are thesame as those of the first hot water supply heating operation. Note,however, that because the hot water supply load is small in the thirdhot water supply heating operation, the controller 5 controls theopening degree of the third expansion valve 18 so that the hot watersupply temperature detected by the hot water supply temperature sensorT10 reaches the hot water supply set temperature.

Fourth Hot Water Supply Heating Operation

The fourth hot water supply heating operation is a hot water supplyheating operation in which hot water supply and heating are performed atthe same time, and is performed when the hot water supply load is smalland the heating load is small. In the fourth hot water supply heatingoperation, the controller 5 sets the flow switching valve 12 to thethird state, in which the first port A communicates with the second portB and the third port C communicates with the fourth port D, and opensthe on-off valve 19. In addition, the controller 5 controls the openingdegree of the first expansion valve 16, the opening degree of the secondexpansion valve 17, and the opening degree of the third expansion valve18 according to an operation state. Furthermore, the controller 5 setsthe frequency of the compressor 11 lower than that of the first hotwater supply heating operation.

The refrigerant flows in the fourth hot water supply heating operationare the same as those of the first hot water supply heating operationshown in FIG. 9 . The control of the opening degree of the firstexpansion valve 16 is the same as that of the first hot water supplyheating operation. Note, however, that, in the third hot water supplyheating operation, the controller 5 controls the opening degree of thesecond expansion valve 17 so that the blowing temperature detected bythe blowing temperature sensor T6 reaches the cooling set temperature.In addition, the controller 5 controls the opening degree of the thirdexpansion valve 18 so that the hot water supply temperature detected bythe hot water supply temperature sensor T10 reaches the hot water supplyset temperature.

FIG. 10 is a table illustrating a list of controls in each operation ofthe refrigeration cycle apparatus 100 according to Embodiment 1. Notethat the controls of the first expansion valve 16 to the third expansionvalve 18 in each operation are not limited to the examples shown in FIG.10 . For example, although the third expansion valve 18 is closed in thecooling operation and the heating operation, as shown in FIG. 10 , thethird expansion valve 18 may be opened. In addition, although the thirdexpansion valve 18 is controlled according to an operation state in thefirst hot water supply cooling operation, the third expansion valve 18may be fully opened regardless of operation state. In this case, thecontroller 5 controls the opening degree of the second expansion valve17 based on the discharge temperature of the compressor 11 or the degreeof subcooling of the third heat exchanger 31.

As described above, in Embodiment 1, hot water supply, cooling andheating can be performed by switching the directions of refrigerant flowby the flow switching valve 12, which can be set to the state (firststate) in which the first port A connected to the discharge port of thecompressor 11 is closed. For this reason, the number of components, suchas valves and pipes, can be reduced as well as the controllability canbe improved, compared with a case where operations are switched by acomplicated valve configuration.

In addition, in Embodiment 1, when the hot water supply load and thecooling load are equal, that is, in the first hot water supply coolingoperation and in a fourth hot water supply cooling operation, the firstexpansion valve 16 is closed so that the refrigerant does not enter thefirst heat exchanger 13. Meanwhile, when the hot water supply load andthe cooling load are not equal, that is, in the second hot water supplycooling operation and in a third hot water supply cooling operation, thefirst expansion valve 16 is opened so that the refrigerant enters thefirst heat exchanger 13. With such a configuration, hot water supply andcooling can be achieved efficiently even when the hot water supply loadand the cooling load are not equal.

Although Embodiment 1 is described as above, the present disclosure isnot limited to Embodiment 1. Various modifications are possible withoutdeparting from the scope of the present disclosure. For example, amethod of obtaining hot water by the hot water supply unit 3 is notlimited to a heat exchange method using a heat medium as described inEmbodiment 1. For example, a heating method may be used in which waterin the hot water storage tank 32 is caused to directly flow in a pipe toexchange heat as a heat medium in the third heat exchanger 31 and iscaused to return to the hot water storage tank 32 again. In addition,the hot water supply unit 3 may be provided with a heat mediumtemperature sensor detecting the temperature of the heat medium flowingin the heat medium circuit, in place of or in addition to the hot watersupply temperature sensor T10.

Furthermore, each of the temperature sensors T1 to T10 used in controlis not an essential component for the refrigeration cycle apparatus 100and can be omitted. For example, in place of the temperature sensordetecting the temperature of refrigerant, a pressure sensor detectingthe pressure of refrigerant may be used to obtain the temperature of therefrigerant from the detected pressure. In addition, the controller 5may obtain the indoor temperature and the hot water supply temperatureby communicating with external devices provided separately from therefrigeration cycle apparatus 100.

REFERENCE SIGNS LIST

1: heat source unit, 2: air-conditioning unit, 3: hot water supply unit,5: controller, 30 11: compressor, 12: flow switching valve, 13: firstheat exchanger, 14: first fan, 15: accumulator, 16: first expansionvalve, 17: second expansion valve, 18: third expansion valve, 19: on-offvalve, 21: second heat exchanger, 22: second fan, 31: third heatexchanger, 32: hot water storage tank, 33: pump, 34: fourth heatexchanger, 100: refrigeration cycle apparatus, A: first port, B: secondport, C: third port, D: fourth port, T1: discharge temperature sensor,T2: first refrigerant temperature sensor, T3: first outlet temperaturesensor, T4: second refrigerant temperature sensor, T5: second outlettemperature sensor, T6: blowing temperature sensor, T7: indoortemperature sensor, T8: third refrigerant temperature sensor, T9: thirdoutlet temperature sensor, T10: hot water supply temperature sensor

1. A refrigeration cycle apparatus comprising: a heat source unitincluding a compressor, a flow switching valve, a first heat exchanger,and an expansion valve; an air-conditioning unit including a second heatexchanger and configured to perform air-conditioning; and a hot watersupply unit including a third heat exchanger and configured to supplyhot water; wherein the flow switching valve includes a first portconnected to a discharge port of the compressor, a second port connectedto the second heat exchanger, a third port connected to a suction portof the compressor, and a fourth port connected to the first heatexchanger, and wherein the flow switching valve is set to one of a firststate in which the second port communicates with the third port, thethird port communicates with the fourth port, and the first port doesnot communicate with any ports, a second state in which the first portcommunicates with the fourth port, and the second port communicates withthe third port, and a third state in which the first port communicateswith the second port, and the third port communicates with the fourthport.
 2. The refrigeration cycle apparatus of claim 1, furthercomprising: a controller configured to control operations of the heatsource unit, the air-conditioning unit, and the hot water supply unit,wherein the controller is configured to perform a hot water supplyoperation in which hot water supply is performed by the hot water supplyunit, a cooling operation in which cooling is performed by theair-conditioning unit, and a heating operation in which heating isperformed by the air-conditioning unit, and wherein the controller isconfigured to set the flow switching valve to the first state in the hotwater supply operation, the second state in the cooling operation, andthe third state in the heating operation.
 3. The refrigeration cycleapparatus of claim 2, further comprising: an on-off valve provided on apipe that is branched from a pipe connecting the discharge port of thecompressor and the first port of the flow switching valve, and that isconnected to the third heat exchanger, wherein the controller isconfigured to open the on-off valve in the hot water supply operation,and close the on-off valve in the cooling operation and the heatingoperation.
 4. The refrigeration cycle apparatus of claim 2, wherein thecontroller is configured to perform a hot water supply cooling operationin which hot water supply by the hot water supply unit and cooling bythe air-conditioning unit are performed concurrently, and switch theflow switching valve to the first state or the second state in the hotwater supply cooling operation according to a hot water supply load anda cooling load.
 5. The refrigeration cycle apparatus of claim 2, whereinthe controller is configured to perform a hot water supply heatingoperation in which hot water supply by the hot water supply unit andheating by the air-conditioning unit are performed concurrently, and setthe flow switching valve to the third state in the hot water supplyheating operation.
 6. The refrigeration cycle apparatus of claim 2,wherein the expansion valve includes a first expansion valve provided onan outlet side of the first heat exchanger in the cooling operation, asecond expansion valve provided on an outlet side of the second heatexchanger in the heating operation, and a third expansion valve providedon a pipe that is branched from a pipe connecting the first expansionvalve and the second expansion valve, and that is connected to the thirdheat exchanger, and wherein the controller is configured to close thethird expansion valve in the cooling operation and the heatingoperation, and close the second expansion valve in the hot water supplyoperation.
 7. The refrigeration cycle apparatus of claim 6, wherein, inthe hot water supply cooling operation in which hot water supplyperformed by the hot water supply unit and cooling performed by theair-conditioning unit are performed concurrently, the controller isconfigured to close the first expansion valve when a hot water supplyload and a cooling load are equal, and open the first expansion valvewhen the hot water supply load and the cooling load are not equal.